Power press



Oct. 3, 1933. H. 4 H, WALSH 1,928,711

POWER PRESS Filed March 2, 1931 2 Sheets-Sheet l XII- NIIIIIIIIIIIIIIIIW oct 3, 1933- H. c. H. wALsH POWER PRESS Filed Ilarch 2, 19,31 2 Sheets-Sheet 2 Patented Oct. 3, 1933 UNITED STATES PATENT ,oIg-l-ICE POWER PRESS Hairy o. n.A Walsh, chicago, n1.

ApplicationMarch 2, 1931. Serial 1095194542 f claims. `(Cl. 19a-17) f 'This invention relates generally -to powerv vllll Further objects and details will appearrfrom a description of the invention in conjunction with the drawings wherein- Y Figure'l is a fragmentary view showing in front elevation the upper portion of a press, with the 1g; Vfly wheel shown in section; l

Fig. 2 is a side elevation showing the brake' mechanism;

Fig. 3 islan enlarged perspective view of the brake mechanism; i so; Fig. 4 is a rear elevation of the clutch mechanism;

` Fig; 5 is a bottomview of the parts shown in Fig. 4; Y

Fig. 6 is a sectional Yview taken onv line 6-, 6

25. 0f Fig- 4,2 Fig. 7 is `an enlarged sectional view taken von line 'l-'lofFig 5; and Y Fig. 8 is an enlarged perspective View of the clutch mechanism showing the clutch bolt withdrawn from contact'with the fly -wheel .(not

shown) Y' 4 j The press may be of usual construction, in that it comprises a base (not-shown) from which upstand standards 10 furnishing overhanging guide 851 members 11 carrying guide plates 12 for the reciprocation of a sliding head 13 which carries the die or other tool employed by the press. vThe sliding head, as Shown,is actuated lby a'pitman 14 terminating at its lower end ,in a ball mounted min a socket 16 at the upper end of the sliding head 13. The pitman at its upper end engages the cranked portion 17 of a crank shaft 18 whichl is carried within journal mountings 19-20 formed at'the upper side ends rof the standards .45 10. At al point outside of the standard 10, and

formed on the crank shaft 18, is a clutch head 21 having an opening V22 in axial alignment there- `within which is slidably mounted a clutch bolt 23. A driving element,'such as a fly wheel 25 'jhaving recesses 24 in the face of its hub is mount-v crank shaft as by a pin 29. By` means of a springV 30, the bell'crankl normally urges lthe clutch into engagement with the `iy wheel. A swinging latch 60. 31, which is normally held in thepath of the bell crank by a spring 32, trips the bell crank to disengage he clutch bolt ata predetermined pointA in. the rotation of the crank shaft, as shown in Fig. 8. Y The latch may be moved from its normal position by a treadle 33 vmounted on a leg 34 which supports the press,V the treadle and latch being interconnected by a rod 35. The details of thesefeatures form no part of the present invention and need not be further described.

y Figs. 1, 2 and 3 illustrate an improved form of brake mechanism which releases the crank shaft upon actuation of the treadle. This mechanism,l

by preference, includes aband 40,' optionally lined as at 41, surrounding a brake drum 42 which 1s made fast with the shaft 18; One end of the band may be secured to a stationary lug 43 projecting from Vthe standard 10, and the free end of the band lmay be connected by a block 44v to an adjusting.

bolt 45. As shown in Figj, the band is bifurcated at 46 on its xedend to providea pair of straps 47 that may be Ybent around the lug 43 and anchored in" openings 48 in the band. Rockably mounted on the lug 43 between the band straps 47 isabifurcated bell crank 49 furnishing atone end la mountingfor-trunnions 50 which 'extend oppositely froma block 51.through which extends the'bolt 451secured thereto by lock nuts 52. ,'The other end of the bell crank 49 is con- Jnected Vbyiinks, 53 manV arm 54 which 1s keyed to a rock shaft 55 mounted inthe Standards 10 and extending therethrolvlghY to the opposite side ,of the press (see Fig. 1) Where'r it is securedto the latch 31.

The latch`31 which is connected fast at one end to the shaft 55, upon swinging down, Will rotate the4 shaft tomove the arm 54 in the direction indicated by the arrow in Fig. 2; this in turnrocks the bell crank 49 by the links 53 to release the freeend of the brake band, thus leaving the crank shaft free to be rotated.

The brake mechanism is soconstructed that itis released simultaneously with each normal operation that occurs. Theoperator depresses the treadle which lpulls down the rod 35 to swing,

down the latch 31, as shown in Fig. 6, thereupon releasing the brake as above described. At the same time the bell crank 28-is releasedfrom engagement with the latch to advance the clutch bolt into one ofthe recesses 24 in the fiy Wheel,

Vthus rotating the crank shaft to make the desired punching; upon completing its cycle of movement the clutch bolt is withdrawn by the latch 31. The brake band is normally urged to act upon the brake drumv 42 by the spring 32 which presses against the latch 31.

`It is found thatfrequently the clutch bolt 23 is not always completely seatedin the recess 24, with the resultl thatvv on the rebound, after the punch, the crank shaft is thrust forward on the upstroke and the clutch bolt rides on the bevel wir which tapers outwardlyrfrom the recess 24, or the bolt may only be advanced far enough to permit the edge to be sheared off or rounded. This is preventedby providing a roller or cam securedl to the standard 10 or to block (S2-the roller or cam being in such a position that when the clutch bolt is not completely seated, it Will contact withV same which positively drives it to the bottomf of the recess (see Fig. 7).

The punch press, as above described, is operated in thev following manner: With rthe. clutch parts in normal position, as viewed in Fig. 8, thev treadle is depressed to Withdraw the latchV fromA contact with the bell crank. When the bell crank is released, the cushion spring bearing againstv one arm thereof advances the clutch bolt into a recess in the hub of the fly Wheel, thus connecting the fly wheel to theV crank shaft. `At the same time that the latch is withdrawn, it'slightly rotates the rock shaft 55 and arm 54 `which releases the brake band from contact with the brake drum, thus permitting theV crank shaft to be freely turned whe'nthe clutch bolt engages the fly wheel. Thisjs'important because, if the brake is not released, the friction exerted thereby causes an added load to be thrust upon the clutch bolt andparticularly at that -point where the clutch bolt is being moved into engagement'with thefly wheel... k

As the crank shaft rotates, the clutch bolt is brought in alignmentjwith the roller 61`where,.if it is not already seated in the recess 24', itwill be forced vtherein by contacting witlfj'the roller.V

Upon releasing the treadle, the spring 32 returns the latch to its normal'position to engage the bell crank upon completion' of onenrevolution of theY crank shaft, and at the same time thejbrakeband j is broughtvinto engagement with the brakefdrum,

so that the crank shaft will be stopped immediatelywhen the clutch b olt is withdrawn. n

' The brake mechanism` herein described is particularly advantageous, in thatr it may be readily attached to a standard punchv press Y.and be operated simultaneously the clutch bolt. k

Although the machine has'been described with particularity, it is not the intention tolimit vthe invention tothe precisie details of construction hereinbefore'set forth, sinceV lit is obvious that a with the latch ,for releasing proper co-ordination-between the clutch and' brake mechanism might be Veffected by other meansw I claim: l A v `.1.. In a punch press having a standard anda lug extending therefrom,jthe combinationA of a crank shaft anda reciprocating'head actuated thereby, the crank shaft having a driving element rotatably mounted thereon and a jclutch bolt for engaging with the driving1 element whereby the crank shaft is rotated, a rock shaft journaled in the` standard, a latch having one end secured tov the rock shaft, the free end of the latchbeing `adapted to disengage the clutch bolt from thev driving element, a 'brake A*band bifurcatedat one end andl surrounding thecrank shaftv with the bifurcated 'end secured'to thelug, a bell .crank mounted on the lug,Y one leg of thejbell crank being connected to the free end of the brake band, an arm extending laterally from the'rock shaft on the end opposite the latch, links connecting megas@ named am to the other arm of the beu crank wherebyinovemkentof the latch will rock thebell crank to release the free end of the brakeV band permitting the crank Ashafttogbe freely rroi tated, and a treadl'e connected to the rock shaft to move the latch and release the brake simultaneously. y v 4 v c j 2. In a punch press having'a crank shaft journaled in a standard, a brake mechanism tending to-hold the shaft against rotation, a driving element rotatable on thev shaft, a spring-pressed clutch bolt movably carried by the shaft and vadapted to establish driving connection with the drivingV element, means interposed between the V`clutch bolt and brake mechanism whereby the brake mechanism` isreleased from frictional engagement with the shaft simultaneously with the initial advance of the clutch bolt into engagement with .theV driving element, and means Securedjto the standard to finally advance the clutch bolt into engagement with the driving element.

3. In a punch press, the combination ofQa standard, a crank shaft journaled` therein, a'fly wheel having recesses at its hub rotatably mounted on'the crank shaft, aspiring-pressed clutch bolt yslidably mounted onthe crankshaft and adapted to enter one of the recesses in the fly wheel to drive the crank shaft, a bell crank piv- `otally connected to the crank shaft ,and havingV one arm connected to the clutch bolt, a vrock shaft journaled Yin the standard, a latch extending from one end Yof the rock shaft with its free end normally lying in the path of the other arm on the bell crank so as to contact therewith to dis- Iengage the clutch bolt, brake mechanism surrounding the shaft at its end opposite the Yily wheel, actuating means connecting the brakeV mechanism -Withthe rock shaft, a spring normally holding the rock shaft ina position whereby the brake mechanismV is in friction engagement with the crank shaft andthe latch lying in a po-` sition to disengage the clutch bolt, and means for rot/ating therock shaft fromits normal position 4. In a punch press, the combination vof a standard, a crank shaftjour'naledtherein, are- Vciprocating head actuated therebyvpay ily Wheel vhaving recessesV in its hubrotatably mountedon the crank shaft, a Spring-pressed' clutch bolt movably mounted on the crank shaft, means for releasing the clutch bolt whereby it is initially moved into one Vof the. recesses ofthe fly wheel to rotate the crankshaft, and means projecting `one of its arrns connectedy to the'Y other end of the brake band, a toggle lever connected .to the otherparm of the bell crank vand adapted to opera'te theA same Yfor. ,tightening the brake band upon the brake drum,` a manually operated rock' shaftconnected to the toggle lever, a driving` element rotatable onV the crank shaft, clutch mechanism'including a clutch bolt between theV crank shaft and driving element, clutch releasing mechanismA secured to the rock'shaft, and spring means associated withsaid'mecnamsms tending to 'tighten the brake band uponvthe brake drum and simultaneously release the clutch mechanism. Y

Y-rIARmI C. H. WALsHqi, 

